Positive tests and now negatives????

I’m currently 9 weeks and 3 days. I’ve been obsessed with testing since we found out and I’ve done around 28 tests (these are the tests my fiancé knows about!) seeing the positive line makes my heart melt and to say I’m obsessed is an understatement!.. I tested today for the first time in a week and it’s negative!!!! Does this mean I’ve lost our baby?.... I had bloods at 4 weeks which confirmed pregnancy and a HCG levels of 560 but now I’m worried!!!.. any one else experienced this?